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Rafael Nadal vs. Juan Martin del Potro might feel as if it’s a Grand Slam semifinal worthy of a final. Each has won the U.S. Open already - Nadal in 2010 and 2013; del Potro in 2009, when he beat Nadal in the semifinals, then Roger Federer in the final. That, though, was the big-hitting Argentine’s only major championship. Nadal, meanwhile, ranks second in men’s tennis history with 15 Grand Slam trophies. Nadal leads their head-to-head series 8-5, but del Potro won their most recent matchup, on a hard court at the Rio Olympics last year. The other semifinal involves two newcomers: 12th-seeded Pablo Carreno Busta of Spain vs. 28th-seeded Kevin Anderson of South Africa. Neither has played in a major semi, let alone a title match. Carreno Busta has not lost a set in the tournament so far, while Anderson boasts a dangerous serve and has only been broken three times in 87 service games.